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公开(公告)号：US20230250503A1
公开(公告)日：2023-08-10
申请号：US18003343
申请日：2021-06-28
CPC分类号： C21D8/1222 , C21D8/1233 , C21D8/1266 , C21D8/1272 , C21D9/46 , C22C38/02 , C22C38/04 , C22C38/08 , C21D2201/05
摘要： Provided is a method of manufacturing a grain-oriented electrical steel sheet that has a uniform texture all along the longitudinal direction and has small fluctuations in magnetic properties. The method includes subjecting a predetermined hot-rolled and annealed sheet to cold rolling, where at least one time of cold rolling has a total rolling reduction of 80 % or more and is performed by a tandem mill, rolling performed in at least one stand of the tandem mill is performed under conditions of a rolling reduction of 30 % or more and a biting temperature To °C of a work roll of the stand, and a temperature at which either or both of a leading end and a tail end of the hot-rolled and annealed sheet are bitten by the work roll is 70° C. or higher and at least 10° C. higher than the temperature To °C.
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公开(公告)号：US20230243009A1
公开(公告)日：2023-08-03
申请号：US18003499
申请日：2021-06-28
发明人： Yukihiro SHINGAKI , Yusuke SHIMOYAMA , Ayaka SERA
CPC分类号： C21D8/1222 , C22C38/04 , C21D1/34 , C21D8/1272 , C22C38/02 , C22C38/08 , C21D8/1233 , C21D8/1266 , C21D2201/05
摘要： Provided is a production method for a grain-oriented electrical steel sheet with which stable magnetic properties are obtained in the same coil. The method comprises: hot rolling a steel slab having a predetermined chemical composition, followed by annealing to obtain a hot-rolled and annealed sheet; cold rolling the hot-rolled and annealed sheet one time, or two times or more with intermediate annealing being performed therebetween, to obtain a cold-rolled sheet, followed by subjecting to primary and secondary recrystallization annealing, wherein in the cold rolling, a rolling reduction ratio is 80% or more at least one time out of the one time or two times or more, and a steel sheet temperature T0 (° C.) while a rolling rate is a set value R0 (mpm) and a steel sheet temperature T1 (° C.) while the rolling rate is less than or equal to 0.5×R0 (mpm) satisfy a formula (1).
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公开(公告)号：US20220186338A1
公开(公告)日：2022-06-16
申请号：US17603239
申请日：2020-01-17
摘要： A method for producing a non-oriented electrical steel sheet used as an iron core material for a motor or transformer and having excellent magnetic properties including subjecting a raw steel material including, by mass %, C: not more than 0.005%, Si: 1.0 to 5.0%, Mn: 0.04 to 3.0%, sol. Al: not more than 0.005%, P: not more than 0.2%, S: not more than 0.005%, N: not more than 0.005% and the remainder being Fe and impurities forming a hot-rolled sheet, subjecting the hot-rolled sheet to hot-band annealing and a single or two or more cold rollings including an intermediate annealing between each rolling forming a cold-rolled sheet having a final sheet thickness and subjecting the cold-rolled sheet to a finish annealing, wherein at least one pass in the final cold rolling at a friction coefficient μ of not less than 0.030 and a rolling reduction of not less than 15%.
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4.发明公开公开(公告)号：US20240279763A1
公开(公告)日：2024-08-22
申请号：US18570067
申请日：2022-06-30
IPC分类号： C21D9/46 , B21B3/02 , C21D1/18 , C21D6/00 , C21D8/12 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/20 , C22C38/22 , C22C38/32 , C22C38/34 , C22C38/42 , C22C38/60 , H01F1/147
CPC分类号： C21D9/46 , B21B3/02 , C21D1/18 , C21D6/001 , C21D6/002 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/1222 , C21D8/1233 , C21D8/1255 , C21D8/1261 , C21D8/1266 , C21D8/1272 , C21D8/1283 , C22C38/001 , C22C38/002 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/20 , C22C38/22 , C22C38/32 , C22C38/34 , C22C38/42 , C22C38/60 , H01F1/14783 , C21D2201/05 , C22C2202/02
摘要： To provide a method of producing a grain-oriented electrical steel sheet that can stably produce a grain-oriented electrical steel sheet with low iron loss and little variation in iron loss using a tandem mill. Disclosed is a method of producing a grain-oriented electrical steel sheet, including: hot rolling; a single cycle of cold rolling, or multiple cycles of cold rolling with intermediate annealing in between; decarburization annealing; and secondary recrystallization annealing, in which annealing preceding final cold rolling is performed with an average cooling rate of 20° C./s or higher in a temperature range from 800° C. to 350° C., and the final cold rolling is performed using a tandem mill, where the steel sheet is heated to a temperature range from 70° C. to 200° C. and then cooled to 60° C. or lower within 10 seconds before being introduced into the first pass of the tandem mill.
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5.发明公开公开(公告)号：US20240052448A1
公开(公告)日：2024-02-15
申请号：US18260473
申请日：2022-01-26
CPC分类号： C21D8/1272 , C21D8/1233 , C21D8/1222 , C22C38/04 , C22C38/02 , C21D9/46 , C21D2201/05
摘要： Provided is a method of manufacturing a grain-oriented electrical steel sheet, with which a grain-oriented electrical steel sheet with low iron loss and little variation in iron loss can be stably manufactured by a tandem mill. The method includes subjecting a steel material to hot rolling to obtain a hot-rolled sheet, subjecting the hot-rolled sheet to cold rolling once or twice or more with intermediate annealing performed therebetween to obtain a cold-rolled sheet with a final sheet thickness, and then subjecting the cold-rolled sheet to decarburization annealing and then to secondary recrystallization annealing, wherein final cold rolling is performed by a tandem mill, and in the final cold rolling, the hot-rolled sheet is heated to a temperature range of 70° C. or higher and 200° C. or lower, then cooled to 60° C. or lower, and then introduced into a first pass of the tandem mill.
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6.发明公开公开(公告)号：US20240287659A1
公开(公告)日：2024-08-29
申请号：US18569600
申请日：2022-06-30
CPC分类号： C22C38/02 , C21D3/04 , C21D6/008 , C21D8/1222 , C21D8/1233 , C21D8/1255 , C21D8/1266 , C21D8/1272 , C21D9/46 , C22C38/04
摘要： To provide a method of producing a grain-oriented electrical steel sheet that can stably produce a grain-oriented electrical steel sheet with low iron loss and little variation in iron loss using a tandem mill. Disclosed is a method of producing a grain-oriented electrical steel sheet, including: hot rolling; a single cycle of cold rolling, or multiple cycles of cold rolling with intermediate annealing in between; decarburization annealing; and recrystallization annealing, in which final cold rolling is performed using a tandem mill, where the steel sheet is heated to a temperature range from 70° C. to 200° C. and then introduced into the first pass of the tandem mill in which rolling in the first pass is performed with a biting temperature T (° C.) and a strain rate e (s−1) satisfying: 0.0378e2+0.367e+37.2>T (1).
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公开(公告)号：US20230250506A1
公开(公告)日：2023-08-10
申请号：US18003339
申请日：2021-06-29
IPC分类号： C21D9/46 , C21D3/04 , C21D8/12 , C21D1/42 , C21D6/00 , C22C38/60 , C22C38/32 , C22C38/22 , C22C38/20 , C22C38/34 , C22C38/16 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00
CPC分类号： C21D9/46 , C21D3/04 , C21D8/1222 , C21D8/1233 , C21D8/1261 , C21D8/1266 , C21D8/1272 , C21D1/42 , C21D8/1283 , C21D6/005 , C21D6/008 , C21D6/001 , C21D6/002 , C22C38/60 , C22C38/32 , C22C38/22 , C22C38/20 , C22C38/34 , C22C38/16 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/008 , C22C38/002 , C22C38/001 , C21D2201/05 , C22C2202/02
摘要： Provided is a method of manufacturing a grain-oriented electrical steel sheet with which a grain-oriented electrical steel sheet with excellent magnetic properties and little variation in iron loss in the longitudinal direction of a coil can be stably manufactured. The method includes subjecting a steel slab to hot-rolling and optionally to annealing, then performing cold rolling once or twice or more to obtain a cold-rolled sheet with a final sheet thickness, and then subjecting the cold-rolled sheet to decarburization annealing and then secondary recrystallization annealing, where immediately before final cold rolling, a steel sheet is heated at a heating rate of 100° C./s or more to a heating temperature of 100° C. or higher and 350° C. or lower, and a time from when the steel sheet reaches the heating temperature to when it is bitten in a first pass of final cold rolling is set to within 5 seconds.
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公开(公告)号：US20220333220A1
公开(公告)日：2022-10-20
申请号：US17753482
申请日：2020-09-04
IPC分类号： C21D9/46 , C22C38/34 , C22C38/12 , C22C38/16 , C22C38/08 , C22C38/06 , C22C38/00 , C21D8/12 , C21D6/00 , H01F1/147
摘要： Disclosed is a grain-oriented electrical steel sheet capable of obtaining excellent magnetic properties stably over the entire coil length. A grain-oriented electrical steel sheet includes: a chemical composition containing, in mass %, C: 0.005% or less, Si: 2.0% to 4.5%, and Mn: 0.01% to 0.5%, and, in mass ppm, N: 20 ppm or less, each of Se, Te, and O: less than 50 ppm, S: less than 30 ppm, and acid-soluble Al: less than 40 ppm, and Ti: less than 30 ppm, of which 5 ppm or more and 25 ppm or less is acid-soluble Ti, with the balance being Fe and inevitable impurities; and precipitates containing Ti and N with a grain size of 200 nm or more at a frequency of 0.05 grains/mm2 or more.
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